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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchUse a SvelteKit +server.ts route to return a generated image, then point the page’s og:image metadata at that route’s absolute, publicly reachable URL. The Sveltekit OG library documents an ImageResponse API for this pattern; it is a library API, not a built-in SvelteKit image-generation feature.
Build a card component and image endpoint
The example below uses a small in-memory page map so the route is self-contained. Replace it with your database or content loader. The code follows the Sveltekit OG ImageResponse pattern; check that library’s current API and your deployment runtime before using it in production.
1. Create the card component
Create src/lib/OgCard.svelte. Its props supply the page-specific title and description to the design.
<script lang="ts">
export let title: string;
export let description: string;
</script>
<div
style="width: 1200px; height: 630px; display: flex; flex-direction: column; justify-content: space-between; padding: 64px; box-sizing: border-box; background: #101827; color: white; font-family: Arial, sans-serif;" >
<div style="font-size: 24px; color: #9fb4d0;">Example site</div>
<div>
<h1 style="font-size: 64px; line-height: 1.08; margin: 0 0 24px;">{title}</h1>
<p style="font-size: 28px; line-height: 1.35; margin: 0; color: #d4deeb;">{description}</p>
</div>
</div>The dimensions match the 1200-by-630 example in the library’s API documentation; they are not a universal requirement for every social platform. The renderer is not a normal browser, so test the actual output rather than assuming every CSS property or asset-loading behavior will match a page in Chrome.
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2. Return an image from a dynamic route
Create src/routes/og/[slug].png/+server.ts. Validate the slug and return a not-found response for unknown content rather than generating a plausible-looking card for the wrong page.
import { ImageResponse } from 'sveltekit-og';
import type { RequestHandler } from './$types';
import OgCard from '$lib/OgCard.svelte';
const pages: Record<string, { title: string; description: string }> = {
'sveltekit-guide': {
title: 'A practical SvelteKit guide',
description: 'Routing, rendering, and deployment explained.'
},
'release-notes': {
title: 'Release notes',
description: 'What changed in the latest release.'
}
};
export const GET: RequestHandler = ({ params }) => {
const slug = params.slug;
const page = slug ? pages[slug] : undefined;
if (!page) {
return new Response('Not found', { status: 404 });
}
return new ImageResponse(OgCard, {
props: page,
width: 1200,
height: 630
});
};The ImageResponse API accepts a Svelte component or raw HTML, dimensions, and component props. Use the installed library’s current signature if it differs from this documented pattern. In a real app, fetch the record using the slug and handle data-source errors separately from missing records. Ensure the route returns the intended image content type and status through the library response.
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3. Point each page’s Open Graph metadata at the image
In the page that loads the article data, construct an absolute image URL from the public site origin. For example, in a Svelte page component:
<script lang="ts">
export let data: {
title: string;
description: string;
slug: string;
canonicalUrl: string;
siteOrigin: string;
};
$: imageUrl = `${data.siteOrigin}/og/${encodeURIComponent(data.slug)}.png`;
</script>
<svelte:head>
<title>{data.title}</title>
<meta property="og:title" content={data.title} />
<meta property="og:description" content={data.description} />
<meta property="og:type" content="article" />
<meta property="og:url" content={data.canonicalUrl} />
<meta property="og:image" content={imageUrl} />
</svelte:head>Supply siteOrigin from trusted deployment configuration, not an unvalidated incoming Host header. The image endpoint and the metadata must both be reachable by the service that fetches the page preview; a relative image path alone is not sufficient. The core tags shown here are commonly used Open Graph metadata, but consult the protocol specification for normative requirements.
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| Approach | Best fit | Trade-off |
|---|---|---|
| Runtime route | Content or image data that changes after deployment, or a route set that cannot be enumerated at build time. | Generation happens when requested. Decide how freshness, caching, and revalidation work for changing content; no universal performance or cost result follows from the implementation alone. |
| Build-time prerender | A finite set of image paths whose page data is available during the build. | Images are generated as build output, avoiding generation on a visitor’s first request, but new or changed content requires an updated build. |
The library documents export const prerender = true and entries for dynamic paths. For a finite list, a route can expose entries along these lines:
export const prerender = true;
export const entries = async () => [
{ slug: 'sveltekit-guide' },
{ slug: 'release-notes' }
];Keep the entries in sync with the content source used by the endpoint. If the source cannot provide all paths and the data needed to render them during the build, prerendering is not a fit without changing that data flow.
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Fonts, logos, and renderer limitations
- Fonts: Custom fonts must be supplied to the renderer as binary data, such as an
ArrayBuffer. The library documents helpers for loading and resolving fonts. Confirm the options shape in its current API before adding font data to the response. - Images and logos: Server-side rendering does not automatically make browser-relative asset paths available. Supply local image data directly, such as a data URL, or use a public absolute URL that the renderer can access.
- Styling: Check the chosen renderer’s supported markup and CSS with the exact component, font, and logo you plan to ship. Do not assume client-side Svelte behavior or all browser CSS is available in image rendering.
- Adapter and runtime: SvelteKit adapters convert build output for particular deployment platforms. Verify that the image library and its dependencies work in the selected adapter’s target runtime. No provider-by-provider compatibility result is established here.
Verify the complete share-preview path
- Open an image endpoint for a known slug and confirm it returns the intended image at the configured dimensions.
- Request an unknown slug and confirm it returns a 404 rather than another page’s card.
- Inspect the rendered page HTML and confirm
og:imagecontains an absolute URL using the correct production origin. - Request that exact image URL without a logged-in browser session. Social preview fetchers need public access to the image.
- After changing mutable content, check that the image and the page metadata reflect the intended version. Configure caching and invalidation to match that freshness requirement.
Troubleshooting
- Import or constructor error: The installed Sveltekit OG version may expose a different module path or option signature. Compare the import and arguments with that version’s ImageResponse API documentation.
- Unknown slug produces a misleading card: Check that the route validates the path parameter and handles absent content before rendering.
- Social preview shows no image: Check that the HTML contains an absolute
og:imageURL and that the URL can be fetched publicly. Also confirm the endpoint responds with a valid image rather than an error page. - Font or logo is missing: Provide the font as binary data and the image as direct data or a reachable absolute URL; do not rely on a browser-relative path.
- Works locally but fails after deployment: Check the selected adapter’s runtime and the renderer’s dependency compatibility, including access to any fonts or remote assets.
- Preview remains stale after content changes: Review caching and regeneration behavior for both the HTML metadata and image response. The appropriate policy depends on the application’s freshness needs.
Or skip the browser setup
ScreenshotNeo is a website screenshot API, not a SvelteKit Open Graph image renderer. It can capture a rendered page as a screenshot, but it does not replace the dynamic image endpoint above. If you separately need a screenshot of a publicly reachable page, one GET request returns the capture:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation. ScreenshotNeo removes cookie banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, and failed loads are not billed. Its MCP server lets AI agents take screenshots. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots. Sign up for ScreenshotNeo’s free plan.
ScreenshotNeo is a website screenshot API and MCP server; use it for page captures, not as a substitute for generating Open Graph artwork.
Frequently Asked Questions
Is ImageResponse part of native SvelteKit?
No. The ImageResponse API described here belongs to the Sveltekit OG library; SvelteKit’s server route is where the response is served.
Can I use prerendering for an unbounded set of slugs?
Prerendering requires the image paths and their data to be enumerable during the build, so an unbounded or unavailable-at-build route set needs a different approach.
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